"So, if there was no "digital footprint" how did they know she bought a gun."
"To meet these threats, our national leaders, military leaders, policy makers and law enforcement personnel must understand who our adversaries are, where they are, and what their capabilities, plans and intentions are. At the same time, we must ensure that we protect our own national security information from those who would do us harm. These are the capabilities that the National Security Agency provides to our nation, to our leaders and to our fellow Americans 24 hours a day, seven days a week."

